Update instances of admin:admin in documentation and fix file location

[derek-ho]

Description

Fixes documentation assuming admin password is admin. Also updates the integration tests to work with the new location of the initial admin password.

Category

[Enhancement, New feature, Bug fix, Test fix, Refactoring, Maintenance, Documentation]

Why these changes are required?

What is the old behavior before changes and new behavior after changes?

Issues Resolved

[List any issues this PR will resolve (Is this a backport? If so, please add backport PR # and/or commits #)]

Testing

[Please provide details of testing done: unit testing, integration testing and manual testing]

Check List

• New functionality includes testing
• New functionality has been documented
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[derek-ho]

This should be backported to 2.x with the other changes (at a later time).

[DarshitChanpura]

Cypress workflows are currently disabled and hence this change would not actually reflect. LGTM otherwise!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6374198) 67.09% compared to head (ffd4ce9) 67.09%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1696   +/-   ##
=======================================
  Coverage   67.09%   67.09%           
=======================================
  Files          94       94           
  Lines        2404     2404           
  Branches      323      318    -5     
=======================================
  Hits         1613     1613           
  Misses        713      713           
  Partials       78       78           

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[opensearch-trigger-bot]

The backport to 2.x failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-2.x 2.x
# Navigate to the new working tree
cd .worktrees/backport-2.x
# Create a new branch
git switch --create backport/backport-1696-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 a88942988684964457082c33965d6a115603e6ac
# Push it to GitHub
git push --set-upstream origin backport/backport-1696-to-2.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-1696-to-2.x.